I decided this was a good day to wheel my
REW computer out to my living room (also known as my Home Theater) and redo the filters on my BFD.
The last time I setup my BFD filters I was in a bit of a rush and wasn't really pleased with the results. I've also noticed lately that I tend to easily forget how to use REW and when someone asks a question on this forum, I suspect they figure they're asking some sort of expert on the subject. They couldn't be further from the truth. After you use the software for a few hours, you become an expert, then you quickly forget - at least I do.
Anyway, unlike many experts here at the shack, I don't use a laptop with an external soundcard for REW duties. I'm sure it's extremely convenient, but since I had an old K6-350 computer lying around I decided to dedicate my REW duties to this PC and make up a set of cables and put it all on a cart that I could wheel out to my system.
Here's a pic of the arrangement....... you'll notice the yellow sticky beside the keyboard to remind me of the steps involved in taking a proper measurement..dup.
Below is the response I get with a Servo-15 subwoofer fed from my Bryston processor with a crossover of 60Hz. I use a fairly low crossover because I have capable mains and I want to give them as much of the spectrum as possible. There is no smoothing on any of my graphs. They are what they are....
Below is the response of the Servo-15 with the filters engaged. It's certainly better than before, but I admit it has some up and down undulation that I could work on for a few hours getting rid of, but I'd never hear the difference. It matches my target house curve close enough.
OK, now below is the response when I add in my mains crossed at 60Hz.
The real reason for my post is to survey people to tell me what they use as a difference between their mains level and their sub level.
You can see I have about a 30dB boost.
Seems like a lot, but it sounds great. I don't think I would get away with this if I crossed at 80Hz, but at 60Hz I feel it's not out of line.
It's only when I reach 30Hz that I have a 30dB boost (not a lot of material down there). At 80Hz, the boost is about 15dB, at 60Hz it's about 20dB.
Opinions?
brucek